Parents leave a staging area after being reunited with their children following a shooting at the Sandy Hook Elementary School in Newtown, Conn., about 60 miles (96 kilometers) northeast of New York City, Friday, Dec. 14, 2012. An official with knowledge of Friday's shooting said 27 people were dead, including 18 children. It was the worst school shooting in the country's history.

Photo: Jessica Hill

Parents leave a staging area after being reunited with their...

Parents leave a staging area after being reunited with their... Photo-3892703.53913 - SFGate

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Swat team officers respond to a school shooting at Sandy Hook Elementary School in Newton, Conn. according to AP. At least 20 people have been killed according to AP, among them 10 children.

Photo: Brian Koonz, News-Times

Swat team officers respond to a school shooting at Sandy Hook...

Swat team officers respond to a school shooting at Sandy Hook... Photo-3892279.53913 - SFGate

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Autorities had scheduled a press conference for 1 p.m. regarding the Sandy Hook Elementary School in Newtown, Conn. but the time has been pushed back multiple times.

State police are responding to multiple shootings at Sandy Hook Elementary School in Newtown, Conn. on Dec. 14, 2012, according to reports. All schools in town are locked down. Frantic parents are converging at the fire station near the school after reports of multiple shootings at the school this morning.

State police are responding to multiple shootings at Sandy Hook... Photo-3892187.53913 - SFGate

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Authorities respond to a report of a shooting at Sandy Hook Elementary School in Newtown, Conn.

Photo: Libor Jany, News-Times

Authorities respond to a report of a shooting at Sandy Hook...

Authorities respond to a report of a shooting at Sandy Hook... Photo-3892165.53913 - SFGate

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This satellite image provided by Google shows the Sandy Hook Elementary School in Newtown, Conn. A shooting at the school Friday, Dec. 14, 2012, left the gunman dead and at least one teacher wounded. (AP Photo/Google)

White House press secretary Jay Carney listens to a follow up question regarding the school shooting in Newtown, Conn., after he told reporters that President Barack Obama is receiving updates on the situation, Friday, Dec. 14, 2012, during the daily press briefing at the White House in Washington. (AP Photo/Charles Dharapak)